Pressure welding machine



April 7, 1931. F. J. BROWN PRESSURE WELDING MACHINE Filed Aug. 15, 1930I 3mm ,Fzza n]: J B rozun Patented Apr. 7, 1931 UNITED STATES PATENTOFFICE FRANK J; BROWN, OF WASHINGTON, PENNSYLVANIA, ASSIGNOR T NATIONALWROUGI-I'I IRON ANNEALING IBOX COMPANY, OF WASHINGTON, PENNSYLVANIA,

A CORPORATION OF PENNSYLVANIA PRESSURE WELDING MACHINE Application filedAugust 13, 1930. Serial No. 475,061.

This invention relates to welding and especially to presses for applyingdies with pressure to metal parts while at welding temperature to effecta joint and in particularis concerned with welding the head to the shellin the manufacture of annealing boxes.

An object of the invention is to produce a joint of neat appearance, byavoiding distortion of the metal walls during welding.

Another object is to produce a joint of uniform quality, texture andstrength.

Another object is to facilitate and reduce thecost of manufacture.

In the accompanying drawing which shows an embodiment of the invention,7

Figure 1 is a side elevation of a press, showing in section a box of thecharacter the press 1s adapted to weld.

Figure2is a front elevation of same, indi eating in dotted lines alarger box and the manner of adjusting dies to different size boxes. I v

Figure 3 is a perspective view of bolster 4 in Figure 1 and the die 8bolted to it.

Figure 4 is a perspective view of the end of top arm of frame 1, Figure1, and the die 17 it supports; and

Figure 5 is a perspective view ofone of the corner dies 27 in Figure 2.

The same numerals refer to corresponding parts in the difierent figuresof the drawing.

In Figure 1 is shown the frame 1 of an open gap press, on which a box isshown,-with its shell 2 lying on the table 3 of bolster l. The shell hasalready been prepared in previous operations and the head 5 of the boxhas been pressed into form to fit well on the shell, with a flange 6.The dotted lines 7 indicate the manner of accommodating boxes of greaterdepth than that shown in section.

In Figure 3 is shown bolster 1 with its die 8, against which the head 5of the box is shown in Figure 1. Die 8 is detachable at 9, permittingdies of various widths to be bolted to the bolster, for accommodatingboxes of different dimensions.

In Figure 2, the box is seen again with its shell 2 and flange 6 of thehead in section. Here the front of die 8 is seen in front view and ispartly broken away, showing parts pressure by a pump and motor inca'sell,

controlled by suitable valves in a manner well understood and not shown.In Figure 1 the plunger 13 is indicated as incontact with the end of adeep shelled box7, but plunger 13 can move out to reach'shells of lessdepth, such as shell 2.

Bolster 4 has a pivot 15, inwhich a stout pin attaches it to block 16,permitting the bolster to drop downward sufiiciently to bringthe box inon to table 3, a ter which the bolster is lifted to the position shown,by means described below.

A die 17, Figure 1, is held by arm 18 in the bevel groove 19, as betterillustrated in Fig.

ure 4, which manner of attachment permits dies of various widths to beinserted for boxes of different dimensions. As seen in Figure 1, die 17is inside the box. Also in Figure 2, die 17 and arm 18 are seen in frontelevation inside shell 2 and head 5. of the box.- Die 8 has two actingfaces, as seen in "Fig ure 3. Face 20 reacts against plungers13andface'21 acts against die 17. Die' 8 issupport ed'on two plungers 22,Figure 2, in cylinders 23,'supplied with oil under pressure from pump14. On releasing oil from cylinders die 8fand the bolster will sinksufficiently' to allow a box to pass between dies 8 and 17 A third pairof plungers 2 1, 24, Figure 2, in cylinders25, set at an angle onsupporting brackets 26, 26 carry dies 27 27'. A die 27 is seen inFigure5, with its concave face 28 to fit around the box cornergas seen in Figure 2, and with bevel supportingmember 29 for attachment to a plunger2 1. Attachment 29' permits the use of dies of different radius. p I

The box,i with shell 2and head'5alrea'dy fittedt ogetlier and heated ina furnace to 1 The view and section welding temperature along the edge,is brought into position on table 3. Oil is admitted to cylinders 23until die 8 has lifted the box into firm Contact with die 1'2, butwithout pressure.

High pressure is then applied in cylinders 12, driving the end surfaceof shell 2 with great force against the inner wall of head 5 andeffecting a weld of these two surfaces. High pressure is now admitted tocylinders 23, setting dies 8 and 1'? with great force against flange (3and the adjacent surface of shell 2, effecting a weld of these surfaces.And finally high pressure is admitted to cylinders carrying the weldpart way around two corners of the box.

Dies 27 are shaped to reach a little more than around the co "her, sothat in Welding the four sides of a box, the complete turn of eachcorner will be welded unt er pressure.

Cylinders 23 are supported by brackets 30 on base 31. The base is of awidth which permits brackets 30 am to be adjusted to a range ofpositions. in the position indicated by dotted lines 264:, plunger 24aaccommodates a box of the dimensions indicated by dotted lines 10.Brackets 30 are adjustable along base 31 to better support die 8 when awider die is used.

The invention is not intended to be limited to the form or any of thedetails shown r described, but to embrace the scope of the followingclaims.

What is claimed is:

1. in a welding press, the combination of .n open gap frame; means onone arm of the raine for holding a die; a bolster pivoted on the otherarm of the frame having means for holding a die and a table forsupporting articles to be pressed; and means adapted to tilt the bolsterand table and to bring the two dies into coaction, with pressure onheated articles between them.

2. In a press for welding boxes, the combination of an open gap frame;means on the upper arm of the frame for holding changeable dies; abolster pivoted. on the lower arm of the frame, having a table forsupporting a box and means for attachment of changeable dies; andhydraulic plungers adapted to tilt the bolster and table and to force anattached die upward.

3. In a welding press, the combination of an open gap frame; means forsupporting a vertically acting die on the upper arm of the frame; abolster pivoted to the lower arm of the frame having means forsupporting a vertically acting die and a horizontally acting die; meansfor causing said vertically acting dies to coact, with pressure onheated articles between them; and means coaoting with said horizontallyacting die to apply pressure on said heated articles.

4. In a press for welding boxes, the combination of an open gap frame,having a base;

n'ieans on the upper arm of the frame for holding changeable dies; abolster pivoted on the lower arm of the frame, having a table forsupporting a box and means for attaching changeable dies; olungers incylinders mounted on the base adapted to tilt the bolste' and table andto force an attached die upward; and plungers in cylinders mounted onthe sides of the frame, adapted to force a box supported on the tableagainst a die attached to the bolster.

5. In a welding press, the combination of an open gap frame; means forsupporting a vertically acting die on the upper arm of the frame; abolster pivoted on the 1 wer arm of the frame having means forsupporting a vertically acting die. and a horizontally acting die; meansfor causing said vertically acting dies to coact, with pressure in onesense on heated articles between them; means coactin with saidhorizontally acting die to apply pressure in a second. sense on saidarticles; and dies with means for applying pressure in a third sense onsaid articles.

(5. In a press for welding boxes, the combination of an open gap frame,having a base; a detachable die held by the upper arm of the frame; abolster pivoted on the lower arm of the frame, having a table forsupporting a box; a second detachable die held by the bolster; plungersin cylinders ad- "ustably mounted on the base, for tilting the bolsterand table and forcing the second die upward to press box members betweenitself and the first die; plungers in cylinders mounted on the sides ofthe frame, for driving a box against the second die; curved dies adaptedto fit around box corners; and plungers carrying the curved dies, in cylinders adjustably mounted on the base, for pressing box members betweenthe first die and the curved dies.

In testimony whereof I affix my signature.

FRANK J. BROWN.

